This CR fixes a small bug in the code path of writing the documents
to the couchdb using bulkload. The loaded revisions numbers were not
getting added to the revision map properly in the case of write-only
keys.

Change-Id: I7977b75a87d13156dd889f20b2e81e75a8c5b7d4
Signed-off-by: manish <manish.sethi@gmail.com>